CN102046943A - Controller of internal combustion engine - Google Patents
Controller of internal combustion engine Download PDFInfo
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- CN102046943A CN102046943A CN2009801189253A CN200980118925A CN102046943A CN 102046943 A CN102046943 A CN 102046943A CN 2009801189253 A CN2009801189253 A CN 2009801189253A CN 200980118925 A CN200980118925 A CN 200980118925A CN 102046943 A CN102046943 A CN 102046943A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 230000008859 change Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 abstract 2
- 230000001052 transient effect Effects 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 230000007812 deficiency Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/06—Cutting-out cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M26/43—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/64—Systems for actuating EGR valves the EGR valve being operated together with an intake air throttle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/116—Intake manifolds for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
An internal combustion engine capable of/switching, the number of operating cylinders between all cylinders and partial cylinders, wherein an EGR rate at the time of a transient operation can be kept appropriately either during an all-cylinder operation or during a partial-cylinder operation. A throttle is operated to have an opening dependent on the control input of an accelerator and the number of operating cylinders such that the outputs during an all-cylinder operation and a partial-cylinder operation are equalized for the same control input of an accelerator. When the opening of a throttle is varied by a variation in the control input of an accelerator, the opening of an EGR valve is varied at a relatively high rate during an all-cylinder operation, and varied at a relatively low rate during a partial-cylinder operation. Preferably, the opening of an EGR valve is varied at a rate dependent on the variation rate of pressure in a surge tank.
Description
Technical field
The present invention relates to the control gear of internal-combustion engine, in particular to the control gear of the internal-combustion engine that possesses the EGR device and the working cylinder number can be switched between whole cylinders and part cylinder.
Background technique
A known part that makes waste gas is back to the EGR device of gas handling system.The EGR device is by exhaust passage and gas-entered passageway EGR passage that couples together and the EGR valve of being located at the EGR passage are constituted.The amount (below, EGR amount) that is back to the EGR gas of gas handling system is to adjust by the aperture of EGR valve.The relevant internal-combustion engine that possesses this EGR device has proposed various control technique as described below, for example Japanese kokai publication hei 7-332165 communique, TOHKEMY 2007-309298 communique or TOHKEMY 2004-27971 communique.
In addition, the known internal-combustion engine that the working cylinder number can be switched between whole cylinders and part cylinder.As above-mentioned TOHKEMY 2004-27971 communique was disclosed, the EGR device also was equipped on this internal-combustion engine.
In the internal-combustion engine that possesses the EGR device, when the transition operation of load variations, when the aperture that makes closure changes, the aperture of EGR valve is changed in the lump.Though this is to depend on the negative pressure of surge tank and the aperture of EGR valve owing to be back to the amount of the EGR gas of gas handling system, as long as the aperture of closure changes, then the negative pressure of surge tank also can change.By the variation with load the aperture of EGR valve is changed, can control the amount of the EGR gas that is back to gas handling system, the EGR as target in the time of can remaining on transition operation leads.
Make the action of the aperture variation of EGR valve like this with the variation of load adaptably, can also can similarly carry out in the internal-combustion engine of switch operating number of cylinders.Yet even load is identical, also there is difference in the negative pressure of surge tank when all working with the part cylinder during cylinders work.In addition, even the variable quantity of load is identical, also different when the variable quantity of the negative pressure of required surge tank is worked with the part cylinder when whole cylinders work.If consider that the EGR amount is closely related with the negative pressure of surge tank, then the EGR when irrespectively suitably keeping transition operation with whole cylinder work and the work of part cylinder leads, and is preferably the aperture of controlling the EGR valve with the method corresponding with the working cylinder number.
Summary of the invention
The present invention makes for solving above-mentioned problem, and its purpose is to provide a kind of control gear of internal-combustion engine, and the EGR in the time of all suitably keeping transition operation when working with the part cylinder when whole cylinders work leads.
A kind of control gear involved in the present invention, it is controlling object with the internal-combustion engine, this internal-combustion engine possesses closure on the gas-entered passageway that relies on the upstream than surge tank, the EGR valve is set will relying on than closure on the gas-entered passageway in downstream and the EGR passage that the exhaust passage couples together, and the working cylinder number all can be being switched between cylinders and the part cylinder.Control gear involved in the present invention possesses throttle operation mechanism and EGR valve operating gear as the device that is used to control this internal-combustion engine.Throttle operation mechanism, with throttle operation to and accelerator-pedal operation amount and the corresponding aperture of working cylinder number so that the output at accelerator-pedal operation amount equates when whole cylinders work and during the work of part cylinder.The EGR valve operating gear is operated aperture and the corresponding aperture of working cylinder number with closure with the EGR valve, reaches desired value so that EGR leads.In detail, when the EGR valve operating gear changes in the aperture that is caused closure by the variation of accelerator-pedal operation amount, when all cylinder is worked, the aperture of EGR valve is changed, and when the part cylinder is worked, the aperture of EGR valve is changed with slower speed with fast speeds.Preferably, with the speed corresponding the aperture of EGR valve is changed with the pace of change of pressure in the surge tank.
When whole cylinders work, working with the part cylinder, be used to make the air quantity of the time per unit that certain output produces roughly the same, but with the charging efficiency difference of the air of every cylinder correspondingly, the pressure difference in the surge tank, the air quantity that is present in the surge tank is also different.When accelerator-pedal operation amount changes, adjust pressure in the surge tank by the operation of closure in the mode of the variation that realizes the output corresponding with this variable quantity.At this moment, make the required air quantity of variation in pressure in the surge tank by closure, different and different according to the working cylinder number.Specifically, air quantity required when all cylinder is worked is few, and air quantity required during the work of part cylinder is many.Since air when the closure pass through speed roughly certain, so if the required air quantity difference of variation in pressure also difference of required time of variation in pressure then.That is to say that all required time of variation in pressure is short during cylinders work, required time of variation in pressure is long during the work of part cylinder.
According to control gear involved in the present invention,, therefore can make the variation of the aperture of EGR valve adapt to the interior variation in pressure fast of surge tank owing to when whole working cylinders are worked, the aperture of EGR valve is changed with fast speeds.On the other hand, owing to when the part cylinder is worked, the aperture of EGR valve is changed, therefore can make the variation of the aperture of EGR valve adapt to the interior slow variation in pressure of surge tank with slow speed.Like this, according to control gear involved in the present invention, the variation in pressure that can adapt in the surge tank changes the aperture of EGR valve, and the EGR in the time of all suitably keeping transition operation when therefore working with the part cylinder when whole cylinders work leads.
In addition, in other modes of the present invention, switching to the working cylinder number under the situation of whole cylinders from the part cylinder, after the working cylinder number is switched to whole cylinders or in the moment that switches to whole cylinders, with closed throttle to the corresponding aperture of whole cylinder work, with closed throttle to the aperture corresponding with whole cylinder work, above-mentioned EGR valve is closed to the corresponding aperture of throttle opening when all cylinders are worked.
By carry out the closing operation of closure and the closing operation of EGR valve in this moment, can prevent that the working cylinder number from producing under the situation of torque deficiency when the transition that whole cylinders switch from the part cylinder, and it is excessive to prevent that EGR from leading.
According to another way of the present invention, switching to the working cylinder number under the situation of part cylinder from whole cylinders, before the working cylinder number is switched to the part cylinder or switch to moment of part cylinder, closure is opened to and the corresponding aperture of part cylinder work, after closure being opened to the aperture corresponding, the EGR valve is opened to the corresponding aperture of throttle opening when working with the part cylinder with the work of part cylinder.
By carry out the opening operation of closure and the opening operation of EGR valve in this moment, can prevent that the working cylinder number from producing the torque deficiency when whole cylinders switch to the transition of part cylinder, and it is excessive to prevent that EGR from leading.
Description of drawings
Fig. 1 has used the brief configuration figure of internal-combustion engine of the present invention for expression.
Fig. 2 is used for the figure that the setting to the movement speed of the related EGR valve of embodiment of the present invention describes.
Fig. 3 is the sequential chart of expression with the close moment of the close moment of the closure of working cylinder number when the part cylinder switches to whole cylinder and EGR valve.
Fig. 4 is the sequential chart as the comparative example of Fig. 3.
Fig. 5 for expression with the closure of working cylinder number when whole cylinders switch to the part cylinder open constantly and the EGR valve open sequential chart constantly.
Fig. 6 is the sequential chart as the comparative example of Fig. 5.
Label declaration
2... internal-combustion engine; 4... gas-entered passageway; 6... surge tank; 8... closure; 10... exhaust passage; 12...EGR passage; 14...EGR valve; 20...ECU.
Embodiment
Each figure referring to figs. 1 through Fig. 6 describes embodiments of the present invention.
Fig. 1 is the brief configuration figure of internal-combustion engine that has used the control gear of embodiments of the present invention.The internal-combustion engine 2 of present embodiment is for having the V-type spark ignition type four-stroke motor of 8 cylinders.8 cylinders that internal-combustion engine 2 is had are divided into A, B group in the mode of single (bank) two cylinders.4 cylinders that belong to the B group possess not shown valve shut-down mechanism, and the suction valve of this cylinder and outlet valve are stopped with closed condition.Cylinder is in dormant state when suction valve and outlet valve stop, and also stops to the fuel supply of this cylinder.That is to say that the internal-combustion engine 2 of present embodiment is can be with the working cylinder number at the variable cylinder motor that all switches between cylinder (8 cylinder) and the part cylinder (4 cylinder).Wherein, for the present invention, as long as at least can the switch operating number of cylinders, thus the structure of valve shut-down mechanism, construct unqualified.
On the air fed gas-entered passageway 4 of each cylinder, be formed with surge tank 6.On the gas-entered passageway of surge tank 6 upstreams, be provided with the closure 8 of electronic control type.In addition, on surge tank 6, be connected with the EGR passage 12 that is connected with exhaust passage 10.On EGR passage 12, be provided with EGR valve 14.The operation of closure 8 and EGR valve 14 is to be undertaken by ECU (electronic control unit, Electronic Control Unit) 20.ECU20 is the control gear of the whole system of Comprehensive Control internal-combustion engine 2, and the switching of working cylinder number is also undertaken by ECU20.
ECU20 judges and the switching of implementation number of cylinders according to the load condition of the speed of a motor vehicle, internal-combustion engine 2.In addition, will be used for switching accordingly according to the reflection and the working cylinder number of accelerator-pedal operation amount decision throttle opening.This is because according to the 8 cylinder work or the difference of 4 cylinder work, with certain throttle opening output 8 cylinders 4 cylinders of the internal-combustion engine 2 that can realize can produce difference.ECU20 operates the aperture corresponding with the working cylinder number with accelerator-pedal operation amount with closure 8 so that when 8 cylinders are worked and 4 cylinders when work equate at the output of the internal-combustion engine 2 of accelerator-pedal operation amount.
In addition, ECU20 will be used for switching accordingly according to the reflection and the working cylinder number of load decision EGR valve opening.When 8 cylinders are worked and 4 cylinders when work, and the air quantity that is used to make internal-combustion engine 2 produce the time per unit of certain output (unit: g/s) roughly the same, however there is difference in the charging efficiency of the air of each cylinder.For example, the charging efficiency during as if the work of 8 cylinders is 25%, needs roughly 50% charging efficiency when then 4 cylinders are worked.With the charging efficiency difference correspondingly, the pressure in the surge tank 6 also can produce difference, lead required EGR valve opening so reach identical EGR, and are different when working with 4 cylinders when 8 cylinders are worked.ECU20 is operable to EGR valve 14 and load and the corresponding aperture of working cylinder number so that when 8 cylinders are worked and 4 cylinders when work lead certain at the EGR of load.Wherein, load is calculated according to throttle opening.
Fig. 2 is the figure that the relation that will speed up amount of pedal operation and throttle opening and EGR valve opening is represented respectively when working at 8 cylinders and during the work of 4 cylinders.As shown in Figure 2, the throttle opening corresponding with same accelerator-pedal operation amount is big when 4 cylinders when work works than 8 cylinders.In addition, the EGR valve opening corresponding with same accelerator-pedal operation amount is big when 4 cylinders when work works than 8 cylinders.Therefore, the increase of the throttle opening when accelerator-pedal operation amount increases and the increase of EGR valve opening are big when all working than 8 cylinders during the work of 4 cylinders.
ECU20 is under the situation that accelerator-pedal operation amount increases, and the variable quantity of corresponding accelerator-pedal operation amount changes the aperture of closure 8, and correspondence makes the aperture variation of EGR valve 14 according to the variation of the load of throttle opening decision.At this moment, ECU20, for closure 8, no matter the working cylinder number has severally, all with the speed corresponding with the pace of change of accelerator-pedal operation amount throttle opening is changed.On the other hand, for EGR valve 14, ECU20 changes the EGR valve opening with fast speeds when 8 cylinders are worked, and with slower speed the EGR valve opening is changed when 4 cylinders are worked.
Corresponding working cylinder number makes the movement speed difference of EGR valve 14, and it be the reasons are as follows.When accelerator-pedal operation amount changes, change the aperture of closure 8 in the mode of the variation that realizes the output corresponding, and adjust the interior pressure of surge tank 6 with this variable quantity.At this moment, make the required air quantity (unit: g), different and different of variation in pressure in the surge tank 6 by closure 8 according to number of cylinders.Air quantity required during the work of 8 cylinders is few, and air quantity required during the work of 4 cylinders is many.For example, if the increment of the air quantity in the 8 cylinders when work required surge tank 6 is 2g, then need the roughly increment of the air quantity of 4g during the work of 4 cylinders.Since air when the closure 8 pass through speed roughly certain, so if the required air quantity difference of variation in pressure also difference of required time of variation in pressure then.That is to say that required time of 8 cylinders when work variation in pressure is short, required time of variation in pressure is long during the work of 4 cylinders.For example, if the transformation period of the pressure in the 8 cylinders when work required surge tank 6 is 0.1 second, then need roughly 0.2 second transformation period during the work of 4 cylinders.
By above content as can be known, if when 8 cylinders are worked, open EGR valve 14, then can make the variation of the aperture of EGR valve 14 cooperate the pressure fast in the surge tank 6 to rise with fast speeds.On the contrary, if when 4 cylinders are worked, open EGR valve 14, then can make the variation of the aperture of EGR valve 14 cooperate the slow pressure in the surge tank 6 to rise with slower speed.Like this, by with surge tank 6 in the pressure aperture that makes EGR valve 14 ordinatedly that rises change, can be when 8 cylinders works and the EGR of 4 cylinders all can suitably keep quickening when working the time lead.
In addition, the decision of the movement speed of above-mentioned relevant EGR valve 14 also is applicable to the situation that accelerator-pedal operation amount reduces.That is to say, under the situation that accelerator-pedal operation amount reduces, close EGR valve 14 with slower speed when closing the work of EGR valve 14,4 cylinders with fast speeds during the work of 8 cylinders.Like this, can make the aperture of EGR valve 14 change with surge tank 6 in pressure descend and cooperate, thereby can be when 8 cylinders works and 4 cylinders when working all suitably the EGR during the maintenance deceleration lead.
Each operation of closure 8 during then, to the switch operating number of cylinders and EGR valve 14 describes.Under the situation of the constant switch operating number of cylinders of the output that keeps internal-combustion engine 2, the aperture that need make closure 8 changes and adjusts pressure in the surge tank 6, and making the aperture of EGR valve 14 change and keep EGR to lead simultaneously is desired value.Operate constantly as the closure 8 of this moment and each of EGR valve 14, shown in each sequential chart of Fig. 4, Fig. 6, can expect the moment identical with the switching of working cylinder number as a case.
In the example shown in the sequential chart of Fig. 4, corresponding switching instant from 4 cylinder work to 8 cylinder work is operated closure 8 and is closed side, and in the identical moment EGR valve 14 is operated and to be closed side.In addition, in the example shown in the sequential chart of Fig. 6, corresponding switching instant from 8 cylinder work to 4 cylinder work is operated closure 8 and is opened side, and in the identical moment EGR valve 14 is operated and to be opened side.Yet EGR under the situation that adopts this moment, might be taken place because cambic pressure balance breaks and lead than cataclysm in time dependent chart as can be known that lead from EGR shown in each figure.
What pay particular attention in the change that this EGR leads is the quick increase that EGR leads.Lead when increasing fast at EGR, have combustion instability and the possibility of catching fire.Catch fire and to cause cogging, a large amount of unburned gas are taken place, even also have the possibility that makes catalyst degradation.On the other hand, lead when reducing fast, have the possibility that pinking takes place at EGR, but pinking, available additive method for example makes ignition timing lag behind and tackles.
In addition, constantly under the situation of little coupling, there is the possibility that cogging takes place in the operation of the switching instant of working cylinder number and closure 8.For example, under the situation that surge tank pressure descends before finishing from 4 cylinder work to the switching of 8 cylinder work,, cambic lack of air descends owing to causing the output of internal-combustion engine 2.The decline of output can not remedy with other modes.In addition, in contrast, also there is the excessive situation of output that causes internal-combustion engine 2 owing to air excess.Yet,, can wait output is adjusted by making the ignition timing hysteresis for this situation.
According to the above research of carrying out, how the closure 8 during relevant switch operating number of cylinders and each operation of EGR valve 14 prevent that the quick increase that change that EGR leads prevents that especially EGR from leading is particularly important.In addition, the output that how to prevent internal-combustion engine 2 descends also extremely important.For this reason, in the present embodiment, when the switch operating number of cylinders, implement the operation of closure 8 and the operation of EGR valve 14 in the following moment.
Fig. 3 is the sequential chart of expression with the moment with the moment of the closing operation of EGR valve 14 of the closing operation of the closure 8 of working cylinder number when 4 cylinders switch to 8 cylinders.The chart of having represented each time variation that surge tank pressure and EGR lead among Fig. 3 in the lump.In Fig. 3, the working cylinder number is labeled as t from the moment that 4 cylinders switch to 8 cylinders
10, the moment that closure 8 is closed to till the aperture corresponding with 8 cylinder work is labeled as t
11, and the moment that EGR valve 14 is closed to till the corresponding aperture of throttle opening when working with 8 cylinders be labeled as t
12
As shown in Figure 3, with the moment t of the closing operation of closure 8
11Be set at switching instant t with the working cylinder number
10The identical moment, or be set at the switching instant moment afterwards.That is to say that ECU20 closes side finishing closure 8 to be operated after the switching of 8 cylinder work from 4 cylinder work.If closure 8 is carried out closing operation in this moment, the air quantity deficiency does not then take place when the switching of working cylinder number, the output in the time of preventing transition descends.
Moment t with the closing operation of EGR valve 14
12Be set at the moment t of the closing operation of closure 8
11The moment before.That is to say that ECU20 operates EGR valve 14 and closes after the side, closure 8 is operated closed side surge tank pressure is reduced.According to the setting in this moment, can avoid the situation that surge tank pressure reduces before EGR valve 14 cuts out, therefore prevented to make EGR lead excessive situation because of the increase of EGR amount.Wherein, be operated into from EGR valve 14 close side play closure 8 be operated into till closing side during, EGR is led become the state that is lower than desired value owing to the EGR amount reduces.In this case, owing to EGR leads the not enough possibility that pinking takes place that exists, but can suppress by ignition timing is lagged behind for pinking.
The switching instant t of working cylinder number
10Moment t with the closing operation of EGR valve 14
12Between context unqualified.In Fig. 3, at first carried out the closing operation of EGR valve 14, close side but also can be after the switching of the number of cylinders of finishing the work EGR valve 14 be operated.
Fig. 5 is the sequential chart of expression with the moment with the moment of the opening operation of EGR valve 14 of the opening operation of the closure 8 of working cylinder number when 8 cylinders switch to 4 cylinders.The chart of having represented each time variation that surge tank pressure and EGR lead among Fig. 5 in the lump.In Fig. 5, the working cylinder number is labeled as t from the moment that 8 cylinders switch to 4 cylinders
20, the moment that closure 8 is opened to till the aperture corresponding with 4 cylinder work is labeled as t
21, and the moment that EGR valve 14 is opened to till the corresponding aperture of throttle opening when working with 4 cylinders be labeled as t
22
As shown in Figure 5, with the moment t of the opening operation of closure 8
21Be set at switching instant t with the working cylinder number
20The identical moment, or be set at the switching instant moment before.That is to say that ECU20 operates closure 8 before the switching of 4 cylinder work in the 8 cylinder work of finishing and opens side.As if the opening operation of carrying out closure 8 in this moment, then when the switching of working cylinder number, do not produce the deficiency of air quantity, the output in the time of can preventing transition descends.
Moment t with the opening operation of EGR valve 14
22Be set at the moment t of the opening operation of closure 8
21The moment afterwards.That is to say that ECU20 opens side and makes after surge tank pressure increases in that closure 8 is operated, and EGR valve 14 is operated opened side.According to the setting in this moment, can avoid the situation that EGR valve 14 is opened under the low state of surge tank pressure, therefore prevented to make EGR lead excessive situation owing to the increase of EGR amount.Wherein, be operated into from closure 8 open side play EGR valve 14 be operated into till opening side during, EGR is led become the state that is lower than desired value owing to the EGR amount reduces.In this case, owing to EGR leads the not enough possibility that pinking takes place that exists, yet, ignition timing can suppress pinking by being lagged behind.
The switching instant t of working cylinder number
20Moment t with the opening operation of EGR valve 14
22Between context unqualified.In Fig. 3, the opening operation of EGR valve 14 is carried out after being, opens side but also can be before the switching of the number of cylinders of finishing the work EGR valve 14 be operated.
More than, embodiments of the present invention are illustrated, but the invention is not restricted to above-mentioned mode of execution, in the scope that does not break away from purport of the present invention, can carry out various distortion and implement.For example, the present invention also can be applicable to other multicylinder engines except that 8 cylinder engines, for example 6 cylinder engines, 4 cylinder engines.
Claims (4)
1. the control gear of an internal-combustion engine, this internal-combustion engine possesses closure on the gas-entered passageway that relies on the upstream than surge tank, the EGR valve is set will relying on than above-mentioned closure on the gas-entered passageway in downstream and the EGR passage that the exhaust passage couples together, and the working cylinder number all can switched between cylinder and the part cylinder, it is characterized in that this control gear possesses:
Throttle operation mechanism, its with above-mentioned throttle operation to and accelerator-pedal operation amount and the corresponding aperture of working cylinder number so that the output at accelerator-pedal operation amount equates when whole cylinders work and during the work of part cylinder; And
The EGR valve operating gear, it operates aperture and the corresponding aperture of working cylinder number with above-mentioned closure with above-mentioned EGR valve, reaches desired value so that EGR leads,
Above-mentioned EGR valve operating gear, when the aperture that is caused above-mentioned closure by the variation of accelerator-pedal operation amount changes, when all cylinder is worked, the aperture of above-mentioned EGR valve is changed, and when the part cylinder is worked, the aperture of above-mentioned EGR valve is changed with slower speed with fast speeds.
2. the control gear of internal-combustion engine as claimed in claim 1 is characterized in that,
Above-mentioned EGR valve operating gear changes the aperture of above-mentioned EGR valve with the speed corresponding with the pace of change of pressure in the above-mentioned surge tank.
3. the control gear of internal-combustion engine as claimed in claim 1 or 2 is characterized in that,
The working cylinder number of above-mentioned internal-combustion engine when the part cylinder is switched to whole cylinder,
Above-mentioned throttle operation mechanism, after the working cylinder number is switched to whole cylinders or in the moment that switches to whole cylinders, with above-mentioned closed throttle to the corresponding aperture of whole cylinder work,
Above-mentioned EGR valve operating gear before above-mentioned closure is closed to the aperture corresponding with whole cylinder work, closes to the corresponding aperture of throttle opening when all cylinders are worked with above-mentioned EGR valve.
4. as the control gear of each described internal-combustion engine in the claim 1 to 3, it is characterized in that,
The working cylinder number of above-mentioned internal-combustion engine when whole cylinders are switched to the part cylinder,
Above-mentioned throttle operation mechanism before the working cylinder number is switched to the part cylinder or in the moment that switches to the part cylinder, opens to above-mentioned closure and the corresponding aperture of part cylinder work,
Above-mentioned EGR valve operating gear after above-mentioned closure is opened to the aperture corresponding with the work of part cylinder, opens to the corresponding aperture of throttle opening when working with the part cylinder with above-mentioned EGR valve.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2009/057756 WO2010119567A1 (en) | 2009-04-17 | 2009-04-17 | Controller of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102046943A true CN102046943A (en) | 2011-05-04 |
Family
ID=42982248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801189253A Pending CN102046943A (en) | 2009-04-17 | 2009-04-17 | Controller of internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110083649A1 (en) |
| JP (1) | JP5099233B2 (en) |
| CN (1) | CN102046943A (en) |
| DE (1) | DE112009004673T5 (en) |
| WO (1) | WO2010119567A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153900A (en) * | 2013-05-13 | 2014-11-19 | 罗伯特·博世有限公司 | Method for operating a gasoline engine having a completely open throttle valve and a gasoline engine |
| CN105683537A (en) * | 2013-10-29 | 2016-06-15 | 马自达汽车株式会社 | Partial-load operation of a gas turbine with an adjustable bypass flow channel |
| CN107882644A (en) * | 2016-09-30 | 2018-04-06 | 长城汽车股份有限公司 | EGR rate control method, system and vehicle with low pressure EGR system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021225668A1 (en) * | 2020-05-06 | 2021-11-11 | Tula Technology, Inc. | Exhaust gas recirculation flow control for reducing emissions with variable displacement internal combustion engines |
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- 2009-04-17 CN CN2009801189253A patent/CN102046943A/en active Pending
- 2009-04-17 WO PCT/JP2009/057756 patent/WO2010119567A1/en active Application Filing
- 2009-04-17 DE DE112009004673T patent/DE112009004673T5/en not_active Withdrawn
- 2009-04-17 US US12/999,944 patent/US20110083649A1/en not_active Abandoned
- 2009-04-17 JP JP2010541610A patent/JP5099233B2/en not_active Expired - Fee Related
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| JP2000045878A (en) * | 1998-07-27 | 2000-02-15 | Mazda Motor Corp | Exhaust recirculation device for engine |
| JP2000104628A (en) * | 1998-09-29 | 2000-04-11 | Mazda Motor Corp | Exhaust flux control device for engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104153900A (en) * | 2013-05-13 | 2014-11-19 | 罗伯特·博世有限公司 | Method for operating a gasoline engine having a completely open throttle valve and a gasoline engine |
| CN105683537A (en) * | 2013-10-29 | 2016-06-15 | 马自达汽车株式会社 | Partial-load operation of a gas turbine with an adjustable bypass flow channel |
| CN105683537B (en) * | 2013-10-29 | 2018-09-28 | 马自达汽车株式会社 | The control device of compression ignition engine |
| CN107882644A (en) * | 2016-09-30 | 2018-04-06 | 长城汽车股份有限公司 | EGR rate control method, system and vehicle with low pressure EGR system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112009004673T5 (en) | 2012-10-11 |
| US20110083649A1 (en) | 2011-04-14 |
| JP5099233B2 (en) | 2012-12-19 |
| JPWO2010119567A1 (en) | 2012-10-22 |
| WO2010119567A1 (en) | 2010-10-21 |
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